Mechanism of inactivation of heat-tolerant spores of Bacillus stearothermophilus IFO 12550 by rapid decompression

The effect of three rapid decompression methods to clear the mechanism of inactivation of heat tolerant spores of Bacillus stearothermophilus IFO 12550 was investigated. Pressurization of the spores at 200 MPa and 75 degrees C for 60 min caused a kill of 10(4) CFU/mL by the link-motion system but th...

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Bibliographic Details
Published in:	Journal of food science Vol. 63; no. 3; pp. 371 - 374
Main Authors:	Hayakawa, I. (Kyushu Univ., Fukuoka-shi, Japan.), Furukawa, S, Midzunaga, A, Horiuchi, H, Nakashima, T, Fujio, Y, Yano, Y, Ishikura, T, Sasaki, K
Format:	Journal Article
Language:	English
Published:	Oxford, UK Blackwell Publishing Ltd 01-05-1998 Institute of Food Technologists Wiley Subscription Services, Inc
Subjects:	adiabatic expansion BACILLUS STEAROTHERMOPHILUS Bacteria BACTERIAL SPORES Biological and medical sciences ESPORAS BACTERIANAS Food engineering Food industries Food processing industry Fundamental and applied biological sciences. Psychology General aspects link motion mechanical disintegration PRESION PRESSION PRESSURE PRESSURE TREATMENT quick decompression SPORE BACTERIENNE Sterilization Physical dressing Temperature effect Bacillaceae Inactivation Pressurizing Pressure relief Mechanism Spores Operating conditions High pressure Bacillales Decontamination Food technology Sterilization Bacillus stearothermophilus Bacteria
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Summary:	The effect of three rapid decompression methods to clear the mechanism of inactivation of heat tolerant spores of Bacillus stearothermophilus IFO 12550 was investigated. Pressurization of the spores at 200 MPa and 75 degrees C for 60 min caused a kill of 10(4) CFU/mL by the link-motion system but the nonrotational rod valve and E.G. seal methods gave a kill of about 10(3) CFU/mL. Sterilization was due to the physical breakdown of spore coat, and was induced by its physical permeability of water at high pressure and temperature. Rapid decompression by the link-motion system at 200 MPa decreased the D-value of the spores from 3000 min (100 degrees C, one atmosphere) to 6 min, 11 min, and 17 min at 95, 85, and 75 degrees C, respectively
Bibliography:	Q03 1999002924 ArticleID:JFDS371 istex:F12153750848B87DC5C860C8A4B69840997DA8A3 ark:/67375/WNG-3R393KDZ-H
ISSN:	0022-1147 1750-3841
DOI:	10.1111/j.1365-2621.1998.tb15745.x